Abstract:

The relationship between the strike of the phyllite ground and the deformation of the tunnel is analyzed and the deformation control measures, including radial grouting and temporary support, are summarized in the paper, with the construction and deformation control of the connection section between the inclined shaft and the main tunnel of West Qinling tunnel on LanzhouChongqing railway in phyllite ground with high ground stress as an example. Suggestion is also made on the technical parameters and crosssection design of such works in such ground conditions. The paper can be served as reference for similar projects in the future.

Key words: high ground stress, phyllite ground, inclined shaft, main tunnel, connection section